import sys
def copy(src_fname,dst_fname):
    src_fobj = open(src_fname,'rb')
    dst_fobj = open(dst_fname,'wb')
    while 1:
        data = src_fobj.read(4096)
        if not  data:
            break
        dst_fobj.write(data)
    src_fobj.close()
    dst_fobj.close()
copy(sys.argv[1],sys.argv[2])
#执行方式
#copy_file.py /etc/hosts /tmp/zhuji.txt